TriVox Health is an online system designed to make it easy for healthcare providers to monitor patients' disease symptoms and functioning over time and in between in-person visits (http://www.youtube.com/watch?v=VR1vcbx0Ef4). Using combined quality improvement and randomized clinical trial methods, we will evaluate the impact of TriVox on the health outcomes, patient/family experience of care, and healthcare utilization for children and adolescents with Attention Deficit Hyperactivity Disorder (ADHD), asthma, autism, depression, and epilepsy.